Combined bit-brace and chain and bench-drill.



No. 714,939. Patented' me. 2. |902.

s. nccLELLAN.

COMBINED BIT BRACE AND CHAIN AND BENCH DRILL.

(Application led Jan. 22 1902.)

(No Mode1-.) 2 Sheets-Shut l.

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COMBINED BIT BR'QE ANUCHMN AND BENCH DRILL.

(Application and Jan. 22, 1902. (No Model.) 2 Sheets-Sheet 2.

Patented Dee. 2, |902.

Unuinp Sterns i ATBNT OFFICE.

STEPHEN IWICOLELLAN, OF BROOKLYN, NEV YORK.

COMBINED BIT-BRACE AND CHAIN AND BENCH-DRILL.

SEEGIFIGATION forming part of Letters Patent No. 714,939, dated December 2, 1902. Application led January 22,1902. Serial No. 90,832. (No model.)

To all whom, t 'may concern:

Be it known that I, STEPHEN MCCLELLAN, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in a Combined Bit- Brace and Chain and Bench-Drill, of which the following is a specification.

My invention is a bit-brace, breast-drill with a universal automatic chain-feeding attachment, and also a bench-drilling machine; and it consists in a frame in which is secured the universal drilling device, an automatic force chain-feed, and means for securing the device to a table or bench for bench-drill purposes.

In the accompanying drawings, Figure 1 is a side elevation of my invention, partly in section. Fig. 2 is a front view of the frame to which the large drilling-wheel for breast or bench drilling purposes is attached, and in which the chuck, with its spindle, passes through, and to which'spindle the automatic construction of the chain-feeding device is attached. Fig. 3 is a back view of the drive- Wheel, showing` the ratchet device. Fig. 4: is a face view of the crank-handle with the ratchet-plunger attached. Fig. 5 is a perspective view of a screw and knurled nut. Fig. Gis a perspective view of a hollow externally-threaded cylinder. Fig. 7 is aface view of a perforated plate. Fig. Sis a perspective view of the cylinder, threaded on its inside and adapted to work on the threads of the externally-threaded cylinder, Fig. C.

My invention is describedas follows.

In my description I will start at the bottom of Fig. 1.

1 is the breastplate, one end .of which ts up under the edge of the table when being used as a bench drill. Journaled in the breastplate is the lower end of the frameshaft 2. Said frame-shaft has at its lower end a right-angle bend and `at the lower end of said right-angle bend a circular groove 2', in which works a set-screw 3, which holds said shaft rigidly in position or allows it to revolve when the tool is used as a common bitbrace. A clamp device fl is swiveled loosely on said shaft 2, so that it may be turned around or moved up'and down. Just above said clamping device is a screw-threaded knurled nut 5,working on the threaded poru tion 6 of said frame-shaft 2 to clamp said device to the table. A screw 7 also passes through a threaded perforation S in the bend of said frame-shaft 2 and enters in a circular depression 8-2- in the extreme end of arm 9 of said clamp device 4, assisting in clamping said device more securely to the table. A short distance above the nut 5 just described said frame-shaft turns to the right at a right angle, and on the top of the bend is a fiat surface 10, and running down through said dat surface and the threaded part of said shaft 2 is a threaded opening 11, and working in said threaded opening is a screw 12, having rigidly secured near its top end a knurled.

nut 13. Just above said knurled nut and to the upper end of said screw 12 is swiveled a table 14, said table being used when the point of the drill is turned down to drill any material held on the said table. Said frame-shaft then turns up vertically, and on said vertical part is preferably swiveled a handle 15, to be used when the machine is used as a common bit-brace. Then above this handle the said frame-shaft turns at a right angle to the left, then at a right angle to a vertical position, and the end of said frame-shaft 2 terminates in a circle-head 16, having on its outerfacea boss projection 17; also, above said boss projection 17 a small boss 18, in which Works a round pointed spring actuated plunger 19. Extending from the center of the inner face of said circle-head 16 is another boss projection 20. Journaled horizontally in said bosses 17 and 2O is acylindrical shaft 21. (See Fig. 2.) Around its periphery and near its outer end are depressions or round holes 21:21- equal distances from each other, in which the round point of the plunger 19 enters and holds said shaft firmly in any position placed. Secured to the left-hand end of said shaft 21 is a frame 22, (see Fig. 2,) in which vertically works the chuck-socket 23. (See Fig. 1.) Said chucksocket is provided with upper and lower circular grooves 24 and 25. Groove 21 is used to adjust inner or under cog-face of bevel gear-wheel 26 with center or small bevel-gear 27 of large bevel gear-wheel 28 when the device is being used as a breast-drill or benchdrill at slow or single speed. Groove 25 is used to adjust outer gear-face of gear-wheel IOO 26 with large outer gear of large gear-wheel 28 when adjusted for fast speed, said chuckshank 23 being kept in either its outer or inner position by the extended point 2% of a set-screw 29, passing through the center of shaft 21, by entering into either groove 24 or 25. Said screw 29 has an enlarged threaded part 30 and knurled head 31, covering the end of the boss 17. The threaded part enters the shaft 21 and holds it firmly in bosses 2O and 17 of head 16 of frame-shaft 2.

On the lower end and right-hand side of frame 22 is a projection 32, bearing, preferably, a sm'all roller which runs against the inner face of circular head 16 to balance the frame 22. On the left-hand side of the said frame 22 is another -boss 33, on which gearwheel 27is journaled and is heldin place bya kn urled nut 34. Said knurled nut 34 may also be used as an additional support to chuckshank 23 by extended point 34 entering into grooves 24 or 25 and is also used to keep ratchet crank-handle arm 34% in position.

On the center and outerface of large bevel gear-Wheel 28 is a circular projection 35, (see Fig. 3,) having on its periphery notches 3G for ratchet purposes. On this extension 35 is secured a crank-handle arm 34%, as mentioned above, by knurled screw 34. Through one end of said crank-arm works a springactuated ratchet-plunger 37, the end of which enters the notches 36 of extension 35.

Extending downward from either edge of frame 22 are arms 38 and 39, (see Fig. 2,) the said arms being bifurcated. Working in the bifurcations of these arms 38 and 39 is a bar 40, provided at each end with means for holding a chain 40%, the chain passing around the material to be drilled and the means for holding the chain. Said bar 40 passes through a headed and externally-threaded screw-cylinder 4l, preventing said cylinder from turning. Said cylinder 4l Works through a perforated plate 42, thence into a headed internally-threaded cylinder 43, which cylinder 43 works smooth-bored in the hollow lower end of chuck-shank 23, the flange or head 42% of Vcylinder 43 abutting against the extended flange 44 of chuck-shank 23. Said iiange 44 of chuck-shank 23 has near its edges and rigidly secured thereto two or more screwthreaded bolts 45, extending downwardly and passing beyond flange 425- of threaded cylinder 43 and through the perforations 46 of the perforated plate 42. (See Fig. 7.) Working on the lower ends of the same threaded bolts 45 are thumb-nuts 47, adapted to press said perforated plate. 42 firmly against the ange 42% of cylinder 43, thus forcing said flange up solidly against flange 44 of chuck-shank 23, thus by friction forcing the cylinder 43 around with chuck-shank 23 when chain-feed is being used, said cylinder 43 causing screwthreaded cylinder 41, with its cross-bar 40, to travel in the bifurcations of arms 38 and 39, either up or down, owing to the way the crank-handle 34% is being turned.

It will be seen that I can by turning the thumb-nuts 47 regulate the automatic feed to suit the work, or by entirely loosening the said thumb-nuts 47 the cylinder 43, with cyli nder 4l and cross-bar 40, will stand still, allowing-chuck-shank 23 to revolve around it freely, stopping the automatic feeding of the chain attachment entirely. It will also be seen that by the revolving of the frame 22 to any point designated by the holes that springbolt 19 Works in in shank 21 of said frame 22 I can use this chain-feeding device in all kinds of close places and in all directions, as well as when straight, and I can re- Verse the chuck and bit directly downward toward the table 14 when the device is attached to a bench for bench drilling purposes and by turning the knurled nut 13 can gradually raise the table toward the chuck and drill, forcing it as needed, and it will be seen that if I want to use this device asa common bit-brace by unscrewing nut 34 out can lift large bevel-wheel 27 from its bearings with its ratchet crank-handle and use the device as a common bit-stock by loosening nut 3 in breastplate 1, allowing frame 2 to be revolved by its loose handle 1,5, while the breastplate stands stationary against the person using the brace, giving ordinary motion of common bit-brace to the device. The frame 22 can be set with spring-bolt 19, holding the chuck in a direct center line with center of breastplate, thus making a truerunning common bit-brace.

Having thus describedmy invention, what I claim as new, and desire to secure by Letters Patent, is-- l. A bit-brace, consisting of a breastplate 1; a frame-shaft 2, having its lower end journaled in said breastplate; a set-screw 3, holding the lower end of said frame-shaft in said breastplate, but allowing it to revolve; a circular head 16, secured to the upper end of said frame-shaft; a boss projection 17, extending from the outer face of said circular head; a smaller boss 18, extending perpendicularly from the outer face of said boss 17; a cylindrical shaft 21, journaled horizontally in said boss 17, and having around its periphery depresssions 2171-; a plunger working through said boss 18, its lower end adapted to enter said depressions; a frame 22, secured to the inner end of said shaft 21; a chuck-socket, provided with circular grooves 24, and 25, and rotating in said frame 22; a screw 29,covering the end of the boss 17, its threaded part entering the shaft 21, and holding it rmly in boss 17; an extended point 295-, of setscrew 29,adapted to enter either of the grooves 24 25, of said chuck-shaft 23; a double-faced` bevel gear-wheel 26, rigidly secured to the chuck-shaft 23, above the frame 22; a boss 33, secured to the frame 22, immediately opposite the bosses 20, and 17; a double-gear drivewheel .2728,revolving on the boss 33; said gear- Wheel adapted to mesh with the under or upper faces 0f th e double-faced gear-wheel 26; crank- IOO IIO

handle 3441-, secured to the double-gear drivewheel 27 2S, and adapted to rotate the same; a knurled nut 34, holding said crank-handle 343,-, in place, and an extended point 34%,-, of said knurled nut adapted to enter either of said grooves 24 25,substantially as shown and described and for the purposes set forth.

2. In combination with a brace-bit,substan tially as shown and described, an automatic feeding device, consisting of arms 3S, and 39, extending downwardly from the chuckframe 22; said arms being bifurcated at their lower ends; chuck-shank 23, having its lower end hollow and extending downwardly between said arms; circular flange 44,extending from thelowerendofsaid hollowchuck-shank; internally threaded cylinder, 43, working smooth-bored in said hollow chuclcshank 23; circular extended flange 424 secured to thelower end of said cylinder 43; a perforated plate 42, abutting against the lower face of flange 429,-; threaded arms extending downwardly from flange 44, and through the perforations 46, of said plate 42; thumb-nuts holding said plate against the lower face of flange 424,-; an externally-threaded cylinder working in the threaded internally-threaded cylinder 43, and having near its head a perforation; a bar 40, passing through the perforation in said cylinder 41, and through the bifurcated ends of the arms 3S, and 39; said arms provided with means for holding a chain, and a chain 4092-, secured to the cross-bar 40, and adapted to hold the material being drilled, substantially as shown and described and for the purposes set forth.

3. In a bit-brace, substantially as shown and described; a chuck-frame 22; a boss 33, extending from said chuck-frame 22, immediately opposite bosses 2O and 17, on the opposite side of said chuck-frame; a double-gear drive-wheel 27 23, revolving on the boss 33; said gear-wheel adapted to mesh with the under or upper faces of the double-faced gear-wheel 26; a circular projection 35, extending from the center and outer face of said gear-wheel, and having around its periphery depressions 36; a crank-handle 345-, one end tting over said projection 35; a spring-actuated ratchet-plunger secured to said handle, and adapted to catch in the depressions 36, of said projection 35; a chuck-shank 23, journaled in said chuck-frame 22, and provided withwcircular grooves 24, and 25; a knurled nut 34, holding said handle 349,-, in pla-ce, and an extended point 34%, of said lnurled nut adapted to enter either of the said grooves 24, or 25, substantially as shown and described and for the purposes set forth.

4. In a bit-brace, substantially as shown and described, ashaft-frame 2, provided with a right-angle bend and having its lower end externally threaded; a breastplate 1, swiveled on the lower end of said frame; clamping device 4, loosely swiveled on said shaft, and having an extended arm 9; aknurled nutworking on said shaft just above said clamping device; a screw 7, passing through a threaded perforation in the shaft-frame, and entering a depression in the extended arm 9, of said clamping device 4; a threaded opening 11, running vertically through the right-angle bend of the shaft-frame; a screw 12, screwing in said threaded opening; a knurled nut 13, rigidly secured near the upper end of said screw; a revolving` table 14, swiveled on the upper end of said screw 12, substantially as shown and described and for the purposes set forth.

5. A bit-brace, consisting of a breastplate 1; a frame-shaft 2, havingits lower end journaled in said breastplate; a circular head 16, secured to the upper end of said frameshaft; a boss projection 17, extending from the outer face of said circular head; a smaller boss 1S, extending perpendicularly from the outer face of said boss 17; a cylindrical shaft 21, journaled horizontally in said boss 17, and having around its periphery depressions 21%; a plunger working through said boss 18, its lower end adapted to enter said depressions; a frame 22, secured to the inner end of said shaft 21; a chuck-socket rotating in said frame 22; a screw 29, covering the end of the boss 17, its threaded part entering the shaftl Vitnesses:

WM. EIERMANN, R. C. DEVEAU. 

